I think their singing sounds great, and I'm thankful they're part of this band.
The total sound while everyone is singing, is in my opinion, elevated to a really beautiful sound, and I don't know if they could get there without Sunshine and Jeff. The last Furthur shows I was at were the Colorado shows this winter, and they just blew me away with the vocals, everybody, not just the backups. Especially during I know you rider and Wharf Rat!

I love the way JK has been singing Wharf Rat, in that trippy way....

Yah, I love he takes it up a notch during the part "I know that the li-ife I'm livin's no good". Gives me goose bumps everytime!

hell yea thats the exact part I was refering to!

I love them too.